The amylase and lipase activity dynamics was studied in experiment on 43 dogs using the method of loading with polysubstrate eatable mixtures while the jaundice simulation after a bile passage restoration. The amylase and lipase amplitude and yield increase as an answer to food introduction in the animals with the obturating jaundice simulation and after a bile diversion operation conduction was established. The fact that such possible dangerous complication as an acute pancreatitis did not occur witnesses the security of enteral probe nutrition.